ISO 5438:1993

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Acid-grade and ceramic-grade fluorspar — Determination of silica content — Reduced-molybdosilicate spectrometric method

Published By	Publication Date	Number of Pages
ISO	1993-03	8

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Categories: 73.080 - Non-metalliferous minerals, ISO

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Description

The method specified is based on decomposition of a test portion by fusion with sodium carbonate and subsequent acidification with hydrochloric acid in the presence of boric acid to complex fluoride, formation of the molybdosilicic acid complex and selective reduction to the blue molybdosilicic acid complex with addition of tartaric acid to prevent interference from phosphate, spectrometric measurement of the absorbance of the coloured complex at the wavelength of maximum absorption (about 795 nm). Applies to products having silica contents, expressed as SiO₂, in the range 0,05 % (m/m) to 4,0 % (m/m).

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	1993-03
Pages Count	8
Language	English
Edition	2
File Size	419.8 KB
ICS Codes	73.080 - Non-metalliferous minerals

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ISO 5438:1993

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